The two appeared before a federal judge in Lower Manhattan where they were arraigned on federal explosives-related charges.

According to the criminal complaint, law enforcement officials have been monitoring Christian Toro's activities for months and decided to move in Thursday in the wake of recent events.

Inside the brothers' Bronx apartment, investigators found low-level components that could be used to make a crude explosive device.

Christian Toro was a teacher at Democracy Prep in Harlem. On January 9th, Toro resigned after allegedly having an inappropriate relationship with a student.

Jeffrey Schneider, a spokesman for Democracy Prep released a statement Thursday night saying,

"Mr. Toro had worked for Democracy Prep Public Schools since August 2016. He did not return to work after December 21, 2017 and officially resigned from Democracy Prep Harlem High School January 9, 2018. After he resigned, Democracy Prep did a routine review of his laptop and was deeply disturbed by suspicious content. We immediately notified law enforcement of the content on Mr. Toro's laptop. We have been cooperating with the New York Police Department and the FBI since the beginning of their investigation and will continue to cooperate with authorities and provide any information we can. Any further questions should be directed to the NYPD and the FBI as this is an ongoing investigation."

Court papers allege that when his brother, Tyler Toro, returned Christian's school-issued laptop, the school found he had searched about bomb making. Christian claimed he was researching the 2013 Boston Marathon bombing.

The FBI went to the charter school to talk to students and discovered he paid some of them $50 an hour to take apart fireworks and recover the powder.